i have a 2012 audi a7, and every time i hit the gas, it makes a sound which almost sounds like "krrrrrrr" and then it stops once the acceleration comes to a complete stop. it happens while the car is stopped and while I'm driving. when I'm driving, i hear the "krrrrrrr" sound before the car comes to a complete stop. I don't know what can be the issue here.
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